Why did most settlers recover from diseases such as measles and smallpox, while those same diseases wiped out significantly large portions of Native American communities?

do NOT use sources. Make it three short sentences.

Most European settlers had developed immunity to diseases like measles and smallpox through previous exposure or vaccination. Native American communities had no previous exposure to these diseases, making them more susceptible to their effects. The lack of immunity and advanced medical care in Native American communities contributed to higher mortality rates.